Incandescent lamp



Oct. 24, 1933. E. c. SMALLY INCANDESCENT LAMP Original Filed March 11, 195i Reisaued a. 24, 1933 um-r se. STATES.

1am; nvcannascsnr, Lam Emanuel c. Smally, Canton, .omo

Original No. 1,900.1, dated April 25, 193:, Serial No.-5z1,e4s,'1\meh 11, 19:1. Application for reissue June 8, 1233.

The invention relates to incandescent electric lamp bulbs, and more particularly to a bulb having a replaceable filament, and having a reflector incorporated therewith, whereby the capacity 0! the lamp for illumination is materially. increased.

'An object of the improvement is to provide an incandescent lamp provided with a socket arranged to detachably receive a plug or base carrying the filament.-

Another object is to provide an incandescent lamp having a reflector incorporated thereinand forming the rear portion of the lamp bulb.

A further object is to provide an incandescent lamp in-which a portion-of the bulb may be removed to remove a burned out filament and to replace the same with a new filament or with a small bulb.

The above and other objects may be attained byconstructing the improved incandescent lamp =20 in the manner illustrated in the accompanying drawing, in which:

Figure 1 is a longitudinal sectional view of the improved incandescent lamp, showing the manner of detachably mounting the filament therein; and V Fig. 2, a similar view, showing the filament replaced by a small bulb.

Similar numerals refer to similar parts throughout the drawing.

air-tight Joint whereby a vacuum may belmaintained within the transparent medium 11 or suitable gas may be contained therein as is customary in ordinary practice.

lnorder to connect the glass or transparent medium to the reflector, a peripheral groove or channel 12 may be formed upon the reflector to receive the edge portion 01 the transparent medium, any suitable sealing material such as indicated at 13 being'used for providing an air-tight joint.

The central portion of the reflector-may be secured to the insulation base 14 provided with the usual screw threaded shell 15 adapted to be inserted into the usual lamp socket. The inner end portion of the insulation base 14 is provided with aso'cketwithinwhichmaybefixedascrew Serlal No. 874,958

threaded tubular metal member 16 electrically connected with the shell 15, as shown at 17. Withinthe bottom of this socket is provided a contact point 18, insulated from the tubular metal member 16 and electrically connected with the usual contact 19, at the end of thebase 14, as shown at 20.

The filament 21 is adapted to be carried by a small base 22 surrounded by a screw threaded metal shell 23 adapted to be received in the threaded tubular member 16 located in the socket 01' the base 14. One end of the filament is electrically connected to the shell 23, as shown at 24, the other end thereof being connected to the contact 25 which contacts with the contact 18, thus completing the circuit through the filament when the base 14 is screwed into a lamp socket. When the filament 21'burns out it may be replaced by a new filament by removing the glass or transparent medium 11 from the reflector 10, 76 and afterthe new filament has been inserted the transparent medium 11 is replaced upon the refiector'and sealed, .the air being exhausted-from the transparent medium, which, if desired, may then be filled with a suitable gas as in ordinary a0 practice.

If desired, the user may himself repair the lamp without returning it to the factory for insertion 01' a new filament as above described. This may be done by removing the glass or transparent as medium 11 from the reflector and removing the filament, a small bulb of any usual and well known design, as shown generally at 26, being inserted into the socket of the base 14, alter which 1 the glass or transparent -medium 11 may be replaced upon the reflector 10, as shown inFig. 2.

with a lamp of this construction an increased lighting capacity is obtained with the consumption of a small amount of current. While such lamps may be used for anyv purpose for which incandescent lamps are adaptable, they are especially advantageous for use in electric signs. For such purpose it will be seen that, the reflector being entirely enclosed and protected from the elements, as well as irom dirt and dust, the emciency oi the lamp "will not be impaired by long use out of doors. a

It will be readily perceived that when it is desired to utilize this particular construction of lamp in connection with certain types of signs and signals, where the reflector is properly enclosed and protected, the glass or transparent medium 11 may be omitted or dispensed with, without aflecting or impairing its emciency or advantages.

Having thus described my invention, what I claim and desire to secure by Letters Patent is: 1. An incandescent lamp of the character .de scribed, having a base filled with insulation having a socket at its inner end, a reflector fixedly and centrally secured within said insulation provided with a peripheral groove, a glass globe mounted within said groove and sealed within the groove to provide an air-tight joint, and .a filament detachably disposed'within saidsocket,

2. An incandescent lamp or the character described, having a base filled with insulation having a socket at its inner end, a saucer-shaped reflector centrally and fixedly secured within said insulation provided with a peripheral groove, a glass globe connected within the groove and sealed therein to provide an air-tight joint, and a filament detachably disposed within said socket and extending within the globe.

3. An incandescent lamp ot the character described, having a base filled with insulation formed with a socket at its innerend, a dished reflector fixedly and centrally secured within the insulation provided with a peripheral groove around its peripheral portion and an upright rim, a glass globe detachably mounted within said groove and sealed'in the groove, and a filament detachably connected to the base within said socket and extending within the globe.

4. An incandescent lamp of the character described, having a base filled with insulation, a reflector centrally and fixedly secured within the insulation provided with a groove around its peripheral portion and an upright rim formation, a glass globe detachably mounted within said groove and rim sealed therein at its peripheral edge, and an incandescent bulb detachably connected to the base and extending within the g obe.

5. An incandescent lamp of the character described, having a base filled with insulation formed with a socket at its inner end, a reflector carried by the base, and provided with a peripheral groove around its peripheral portion and a rim, a transparent medium detachably mounted within said groove sealed at its peripheral edge,

and an incandescent bulb detachably connected groove and anincandescent bulb detachably connected to the base and extending into the reiilector.

7. 'An incandescent lamp of the character described, having a base filled with solid insulation, said insulation being provided with a socket 1 formed at its upper central portion, ,a metal mem- 1 ber disposed on the outer surface 01' the base and a metal member disposed within the socket, said members being electrically connected, a reflector having a central rearwardly projecting portion fixedly secured within the solid insulation between the two metal members, said reflector being in contact with the upper surface of the insulation, and an incandescent bulb fitted within the socket and extending into said reflector.

a EMANUEhQ-vSMALLY. 

